Add a bedroom, expand your living area, or create more space for family.
Sullivan Homes designs and builds additions to fit your existing home.
Update your kitchen or bathroom with better storage, new fixtures, and a layout that fits your needs.
Cabinets, countertops, and room to cook.
Showers, vanities, and improved access.
Make your home safer and easier to move through as your needs change.
We plan modifications around your mobility needs.
| Jurisdiction | Maximum ADU Size |
|---|---|
| City of Spokane | 1,000 sq ft |
| Unincorporated Spokane County | 800 sq ft (detached ADU, main/ground floor) |
| Kootenai County | 1,000 sq ft (or 50% of the primary home's habitable space, whichever is greater) |
These limits are current as of 2026 and subject to change. Washington HB 1337/HB 1345 and Idaho SB 1354 are reshaping local codes. Coeur d'Alene is under a mandate to rewrite its ADU ordinance by February 1, 2027.
ADU regulations are evolving under recent state legislation — confirm current requirements with your local planning department before finalizing project scope.